How to open PDF in relative directory folder from Link Annotation

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Q:

Does your iOS SDK support navigation of links between pdf files in a multi-level directory structure?

A:

Yes, you would modify the makeNewAnnotationSelection method in AnnotEditTool.m file. Reading the Action and Destination objects will get the file path. It would then be up to you how to handle opening the new file.

https://www.pdftron.com/pdfnet/mobile/docs/iOS/src/Classes/PTAction.html
https://www.pdftron.com/pdfnet/mobile/docs/iOS/src/Classes/PTDestination.html

For Android and WinRT you would do something similar.